The Cortex-A9 processor implements the ARMv7 debug architecture as described in the ARM Architecture Reference Manual.
In addition, there are:
Cortex-A9 processor specific events. These are described in Performance monitoring events.
System coherency events.
The debug interface consists of:
a Baseline CP14 interface
an Extended CP14 interface
an external debug interface connected to the external debugger through a Debug Access Port (DAP).
Figure 10.2 shows the Cortex-A9 debug registers interface.